stty: simplify and ignore BREAK/SIGINT
stty: simplify and ignore BREAK/SIGINT

It is up to /bin/login, sulogin, or plain shells to unblock SIGINT.

Signed-off-by: Joachim Wiberg <583c295fd7602c168ad814279bbc3894ba65f5d6@gmail.com>

troglobit/finit,troglobit/finit